We examine the link between marriage and fertility in South Korea by focusing on the historic trend of bridal pregnancy (marriage preceded by pregnancy) over the four decadal marriage cohorts since the 1970s. We first demonstrate how the rate of bridal pregnancy changes over the observed period and then investigate the educational differentials in the trend. These inquiries are examined by analyzing a sample of 29,213 ever-married Korean women from recently pooled data from the National Survey of Fertility and Family Health (NSFFH). The results show that bridal pregnancy has increased from 16% in the 1970s marriage cohort to 20% in the 2000s marriage cohort. In response to class differentials, while bridal pregnancy has been more prevalent among less-educated women than among their counterparts, bridal pregnancy has increased across all education groups over time. In addition, the magnitudes of increase are more noticeable among highly educated women of recent marriage cohorts. We contextualize our findings and provide speculations about subsequent family changes in South Korea.